<!DOCTYPE html>
<html lang="zh-Hans">

<head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>lesson1</title>
    <script src="https://unpkg.com/vue@next"></script>
</head>

<body>
    <div id="root"></div>
</body>

<script>
    Vue.createApp({
        data() {
            return {
                content: 1
            }
        },
        mounted() {
            console.log('mounted');
            setInterval(() => {
                this.content += 1;
            }, 1000);
        },
        template: `
            <div>
                {{content}}
            </div>
        `
    }).mount('#root');
</script>

</html>